ATMEL AT43311

AT43311
Features
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Self-Powered Hub with Bus Power Controller
Full Compliance with USB Spec Rev 1.0
Full Speed USB Host Interface
Four Downstream Ports
Downstream Support for Full Speed and Low Speed Transfer Rates
Continual Monitoring of Port by System Host
Individual Port Power Control
USB Connection Status Indicators
6 MHz Oscillator with On-Chip PLL
USB Hub
Description
The AT43311 is a fully compliant USB hub chip with 5 ports, one upstream port and
four full/low-speed downstream ports. The AT43311 can be used as a stand alone or
can provide a simple and quick method of adding USB ports to an existing device.
As a repeater, the AT43311 provides upstream connectivity between the selected
function and the host. Connectivity involves setting up and tearing down connections,
handling bus faults, recovering from bus faults and detecting downstream device connections and disconnections.
The AT43311 may also act as a hub controller managing the hub operations and
recording the status of the hub, bus transactions, and downstream ports. In this mode,
the AT43311 tracks and generates the bus enumeration, provides configuration information to the host, provides individual port status to the host, and controls the port
operation based on host commands.
AT43311
Preliminary
Pin Configurations
SOIC/DIP/Cerdip
PWR2
PWR3
PWR4
VCC5
VSS
OSC1
OSC2
LFT
VCCA
OVL4
OVL3
OVL2
OVL1
VREF
GND
STAT4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
PWR1
DP4
DM4
DP3
DM3
GND
DP2
DM2
VCC3
DP1
XDM1
DP0
DM0
STAT1
STAT2
STAT3
0738A-A
1
LFT
OSC1
OSC2
DP0
DM0
Block Diagram
VCC5
TIMING
AND
CONTROL
PORT 0
HUB CONTROLLER
VCC3
HUB
REPEATER
Serial Interface
Engine
VCCA
VREF
Endpoint 0
GND
PORT 1
Note:
2
1.
DM4
DP4
OVL4
PORT 4
STAT4
PWR4
DM3
DP3
OVL3
PORT 3
STAT3
PWR3
DM2
DP2
PORT 2
OVL2
DM1
DP1
OVL1
STAT1
PWR1
Overcurrent
Protection/
Reporting
STAT2
PWR2
Endpoint 1
This document assumes that the reader is familiar with the Universal Serial Bus and therefore only describes the unique
features of the AT43311 chip. For detailed information about the USB and its operation, the reader should refer to the Universal Serial Bus Specification Version 1.0, January 19, 1996.
AT43311
AT43311
Pin Description
Pin Description
Pin Type
Description
OSC1
I
Oscillator Input. Input to the inverting 6 MHz oscillator amplifier.
OSC2
O
Oscillator Output. Output of the inverting oscillator amplifier.
LFT
I
VREF
I
Reference Voltage. This is an input pin that should be connected to an external
voltage source. VREF is used internally as the reference voltage by the overload
protection circuit to decide whether there is a problem with a port’s power supply.
DP0
B
Upstream Plus USB I/O. This pin should be connected to VCC3 through an external
1.5K Ω pullup resistor. DP0 and DM0 form the full speed differential signal pin pairs
connected to the Host Controller or an upstream Hub.
DM0
B
Upstream Minus USB I/O
DP[1:4]
B
Port Plus USB I/O. These pins should be connected to VSS through external 1.5K Ω
resistors. DP[1:4] and DM[1:4] are the differential signal pin pairs to connect
downstream USB devices.
DM[1:4]
B
OVL[1:4]
I
Port Overload. These are the input signals used to indicate to the AT43311 that there
is a power supply problem with the port. If OVL is asserted, the AT43311 will assert
the corresponding PWR[1:4] pin and report the status to the USB Host.
PWR[1:4]
OD
Power Switch. These are the output signals used to enable or disable the external
voltage regulator supplying power to the port. PWR[1:4] is de-asserted when a power
supply problem is detected at OVL[1:4].
For proper operation of PWR[1:4], an external pull-up resistor of 10K Ω to VCC5 is
required.
STAT[1:4]
O
Connect Status. These are output pins indicating that a port is properly connected.
STAT[1:4] is asserted when the port is enabled.
VCC3
V
3.3V Power Supply, used for the USB interface
VCC5
V
5V Power Supply, main power supply for the AT43311
VCCA
V
5V Analog Power Supply
GND
V
Ground
PLL Filter. For proper operation of the PLL, this pin should be connected through a
100 Ω resistor and 10 nF capacitor to ground (VSS) in parallel with a 2.2 nF capacitor
(see Figure 1–Power Supply Connection).
Port Minus USB I/O. These pins should be connected to VSS through external 15K Ω
resistors. DP[1:4] and DM[1:4] are the differential signal pin pairs to connect
downstream USB devices.
3
USB Hub Description
The Hub Repeater implements a frame timer that is timed
by the 12 MHz USB clock and is reset every time an SOF
token is received from the Host.
Hub Repeater
The hub repeater is responsible for port connectivity setup
and tear-down. The repeater also supports exception handling such as bus fault detection and recovery, and connect/disconnect detection.
When a SOP token is detected on the upstream port,
Port0, the AT43311 determines the speed of the transfer.
A USB hub must not propagate a full speed transfer to a
low speed port due to the possible misinterpretation of the
data. The AT43311 will propagate the packet to all enabled
downstream ports.
Note: See USB Specification for further detail on bus
states
The AT43311 supports downstream data signaling at both
1.5 Mbps and 12 Mbps. Devices attached to the downstream ports are either full speed or low speed depending
on which data line (DP or DM) is pulled high. If a port is
enumerated as low speed, the output buffers operate at a
slew rate between 75 ns and 300 ns. The AT43311 will not
propagate any traffic to that port unless it is prefaced with a
preamble PID. Low speed data following the preamble PID
is propagated to both low and full speed devices. The
AT43311 will enable low speed drivers within four fullspeed bit times of the last bit of a preamble PID, and will
disable the drivers at the end of an EOP. The upstream
traffic from any port to the host is propagated by Port0
using the full speed 4-20 ns slew rate drivers.
All ports are independently driven and monitored on the DP
and DM pins. The AT43311 detects or generates the ‘J’,
‘K’, and SE0 bus signaling states. Each hub port has single-ended and differential receivers on its DP and DM lines.
The ports’ I/O buffers comply to the voltage levels and drive
requirements as specified in the USB Specifications Revision 1.0.
Hub Controller
The hub controller manages and records the operations of
the AT43311. During enumeration, the controller sends the
host the configuration information. The controller also
allows the host to retrieve the status of the downstream
ports, and power the downstream ports. The controller
applies power to the downstream ports on a per port basis.
After configuration, the controller will enable the power to a
downstream port upon a SetPortPower command by the
host. The controller supports two endpoints and a Control
Status register.
Serial Interface Engine
The Serial Interface Engine (SIE) converts data between
the serialized USB format and usable data for the controller
and repeater. To carry out these tasks, the SIE is able to
detect or generate USB signaling. Once a valid operation is
detected, the SIE translates the data depending on the
operation.
During a reception, the SIE will use the high speed clock
supplied by the PLL to help synchronize and separate the
synchronization information from the data. The data must
be decoded before the SIE may supply the packet ID to the
controller and repeater.
The USB protocol uses Cyclical Redundancy Check
(CRC), Non Return to Zero Invert (NRZI) data encoding
and bit stuffing to improve the reliability of data transfers.
The SIE must decode the NRZI and strip off the stuffed bit
to determine the actual data. The CRC information will be
used by the SIE to determine if a transmission error has
occurred. If an error has occurred, the SIE will correct the
data using CRC algorithms.
Control Status Register
Bit
0
1
4
Function
Value
Description
0
1
Set to 0 or 1 by a Set_Configuration Request
Hub is not currently configured
Hub is currently configured
0
1
Set to 0 or 1 by ClearFeature or SetFeature request
Default value is 0
Hub is currently not enabled to request remote wakeup
Hub is currently enables to request remote wakeup
Hub configuration status
Hub remote wakeup status
2
Endpoint0 STALL status
0
1
Endpoint0 is stalled
Endpoint0 is stalled
3
Endpoint1 STALL status
0
1
Endpoint1 is not stalled
Endpoint1 is stalled
AT43311
AT43311
Endpoint0
Endpoint0 is the AT43311’s default endpoint used for enumeration of the Hub and exchange of configuration information and requests between the Host and the AT43311.
Endpoint0 supports control transfers.
Standard USB Device Requests and class-specific Hub
Requests are supported through Endpoint0.
The Hub Controller supports the following descriptors
through Endpoint0 (Descriptors are described in detail in
the Descriptors Section of this document):
• Device Descriptor
• Configuration Descriptor
• Interface Descriptor
• Endpoint Descriptor
• Hub Descriptor
Endpoint1
Endpoint1 is used by the Hub Controller to send status
change information to the Host. Endpoint1 supports interrupt transfers.
The Hub Controller samples the changes at the end of
every frame at time marker EOF2 in preparation for a
potential data transfer in the subsequent frame. The sampled information is stored as a byte in Status Change Register using a bitmap scheme.
Each bit in the Status Change Register corresponds to one
port as shown below.
An IN Token packet from the Host to Endpoint1 indicates a
request for port change status. If the Hub has not detected
any change on the ports or any changes in the hub itself,
then all bits in this register will be 0 and the Hub Controller
will return a NAK to requests on Endpoint1. If a change in
the port status exists, the Hub Controller will transfer the
whole byte. The Hub Controller will continue to report a status change when polled until that particular change has
been removed by a ClearPortFeature request from the
Host. No status change will be reported by Endpoint1 until
the AT43311 has been enumerated and configured by the
Host through Endpoint0.
Power Management
The AT43311 is designed to be powered from the USB
bus. As such, the power consumption for the AT43311
itself is less than 100 mA. However, downstream devices
require separate power supplies. The AT43311 monitors
and controls each power supply to the individual downstream devices.
Careful design and selection of the power switch is
required to meet the USB specification. The USB specifications requires that the voltage drop at the power switch be
no more than 100 mV. USB requirements specify that a
downstream device may use a maximum of 500 mA. These
conditions are best met by using a MOSFET switch with an
on resistance of 200 mΩ or less.
As a sample power circuit, consider a P-channel enhancement mode MOSFET. The condition of the port’s power is
monitored at the output side of the PMOS switch which is
connected to the port’s OVL[1:4] pin. During an overcurrent
condition, the MOSFET switch’s internal resistance causes
the MOSFET’s output voltage to drop at the OVL[1:4] pin. If
the MOSFET’s output voltage drops to less than the voltage at the VREF voltage reference pin, the AT43311 interprets this drop as an overcurrent condition. The AT43311
does internal filtering to make sure that spurious or switching transients are ignored. If an overcurrent condition
exists, the AT43311 removes the power from that port by
de-activating the port’s PWR[1:4] pin and reports the condition to the Host.
Status Change Register
Bit
Function
Value
Meaning
0
Hub status change
0
1
No change in status
Change in status detected
1
Port1 status change
0
1
No change in status
Change in status detected
2
Port2 status change
0
1
No change in status
Change in status detected
3
Port3 status change
0
1
No change in status
Change in status detected
4
Port4 status change
0
1
No change in status
Change in status detected
Reserved
0
Default values
5-7
5
Figure 1. Power Supply Connection
3V REG.
From upstream power regulator
VCC5
GND
VCC3
AT43311
5.5V
VREF
PWR
OVL
DP
DM
STAT
To downstream device
5V POWER
SUPPLY
VCC5
VSS
Figure 1 illustrates an example of the power supply connection for a AT43311 port.
Careful consideration must be taken to avoid large ground
current surges. There is the possibility that the upstream
device and the self powered device will be sourced from
different electrical power outlets which share no common
ground.
When designing the local power supply for the AT43311 or
a self powered device, local 5V power must be isolated.
This isolation can be achieved through a transformer or by
proper design of the switching power supply. The GND of
the Hub or device can then be safely connected to the
upstream ports ground line for proper operation of the USB
signals.
Even though the devices in a USB network share a common ground (VSS), the two 5V supply voltages of the
AT43311 based hub (the upstream’s bus power and the
local power) must not be connected under any condition.
Port [1:4] Power Control
Each port has signals for port power management and for
port status feedback (PWR[1:4], OVL[1:4], and STAT[1:4]).
The AT43311 monitors and switches the power to each
port individually.
PWR[1:4] are open drain outputs that control the power to
the downstream ports. The AT43311 asserts a low value to
ports PWR[1:4] to turn on the power to the port. During
6
AT43311
power up, reset, and initialization of the Hub, PWR[1:4] is
in-active. PWR[1:4] is asserted when the Host instructs the
Hub to power the port through the SetPortPower = ON
command. Additionally PWR[1:4] is de-asserted by the Hub
when an overcurrent condition is detected at the port.
For proper operation of PWR[1:4], an external pull-up resistor to VCC5 is required for PWR[1:4] pins. To control the
power to the port, any switch with a low voltage drop with
full power applied is acceptable. The AT43311 is designed
for a simple, low cost P-channel MOSFET to use as the
switch.
To detect a port overload, the AT43311 compares OVL[1:4]
to a common VREF defined by the designer.
OVL[1:4] should be attached to the power supply of the
respective downstream port. If OVL[1:4] drops below the
reference voltage VREF for more than 1 ms, the AT43311
treats the drop in voltage as a fault condition on the port’s
power supply. Upon this fault condition, the AT43311 sets
the port’s PORT_OVER_CURRENT status bit and the
port’s C_PORT_OVER_CURRENT bit. The AT43311 will
additionally shut off the power to the port by de-activating
the port’s PWR[1:4] signal.
The STAT[1:4] pins are not required by the USB specification. STAT[1:4] provide feedback to the user whenever a
device is properly connected to the port. An LED and series
resistor connected to STAT[1:4] can be used to provide
AT43311
visual feedback. The default state of STAT[1:4] is inactive.
After a port is enabled AT43311 will assert the port’s
STAT[1:4].
Oscillator and Phase-Locked-Loop
To reduce EMI and power dissipation in the system, the
AT43311 on-chip oscillator is designed to operate with a 6
MHz external crystal. An on-chip PLL generates the high
frequency for the clock/data separator of the Serial Interface Engine. In the suspended state, the oscillator circuitry
is turned off.
A 6 MHz parallel resonance quartz crystal with a load
capacitance of approximately 10 pF is recommended. If the
crystal load capacitor is larger, external capacitors added to
pins OSC1 and OSC2 are recommended. The values for
these capacitors depends on the crystal and the layout of
the board, but typically are 33 pF at OSC1 and 47 pF at
OSC2. If the crystal used cannot tolerate the drive levels of
the oscillator, a series resistor between OSC2 and the crystal pin may be used.
Figure 2 shows how to properly connect the oscillator for
the AT43311. Ceramic resonators are not recommended
due to the frequency stability required by the USB specification (0.25%).
If desired, the clock can be externally sourced. To clock
externally, connect the clock source to the OSC1 pin, while
leaving the OSC2 pin floating. The switching level at the
OSC1 pin can be as low as 0.47V (see electrical specifications). A CMOS device is required to drive this pin to maintain good noise margins at the low switching level.
For proper operation of the PLL, see Figure 1–Power Supply Connection.
To provide the best operating condition for the AT43311,
careful consideration of the power supply connections are
recommended. Use short, low impedance connections to
all power supply lines: VCC5, VCC3, VCCA, and VSS with
0.1 µF decoupling capacitors of high quality adjacent to the
device pins.
Descriptors
Figure 2. Oscillator and PLL Connection
The Hub Controller supports the following standard USB
descriptors: Device, Configuration, Interface, and Endpoint
Descriptors, as well as the class specific Hub Descriptor.
All the required Standard Requests and Hub Class-Specific
Requests are supported by the AT43311’s Hub Controller.
7
Device Descriptor
The Device Descriptor provides general information about the AT43311 Hub.
Offset
8
Field
Description
Size (bytes)
Value
0
bLength
Define size of descriptor = 18 bytes
1
12H
1
bDescriptorType
Device descriptor type
1
01H
2
bcdUSB
USB Spec. Release Number = Rev 1.0
2
00H
01H
4
bDeviceClass
Class code = HUB_CLASSCODE = 09
1
09H
5
bDeviceSubClass
Subclass code
1
00H
6
bDeviceProtocol
Protocol code
1
00H
7
wMaxPacketSize0
Max. packet size for Endpoint0 = 8-bytes
1
08H
9
idVendor
Vendor ID = Atmel Corporation
2
EBH
03H
10
idProduct
Product ID = AT43311
2
11H
33H
12
bcdDevice
Device release number
Example:
Rev A0
YY = 01
Rev B1
YY = 02
2
ZZH
YYH
ZZ = 00
ZZ = 01
14
iManufacturer
Index of string descriptor describing
manufacturer = not supported
1
00H
15
iProduct
Index of string descriptor describing product =
not supported
1
00H
16
iSerialNumber
Index of string descriptor describing device’s
serial no. = not supported
1
00H
17
bNumConfigurations
Number of possible configurations = 1
1
01H
AT43311
AT43311
Configuration Descriptor
This Configuration Descriptor provides information about the AT43311’s configuration.
Offset
Field
Description
Size (bytes)
Value
0
bLength
Define size of this descriptor = 9 bytes
1
09H
1
bDescriptorType
Descriptor type = Configuration
1
02H
2
wTotalLength
2
22H
00H
4
bNumInterface
1
01H
5
bConfigurationValue
Argument value for this configuration to be used
by Set Configuration command
1
01H
6
iConfiguration
Index of string descriptor describing this
configuration (not supported).
1
00H
7
bmAttributes
Configuration characteristics = Bus and Self
Powered with Remote Wakeup
1
E0H
8
MaxPower
Maximum power consumption of USB device
from bus = 100 mA
1
32H
Total length of data returned for this
configuration. Consists of the combined length
of configuration, interface, endpoint and hub
descriptors = 52 bytes
Number of interfaces supported by this
configuration.
Interface Descriptor
The Interface Descriptor provides information about the single interface which the AT43311 supports.
Offset
Field
Description
Size (bytes)
Value
0
bLength
Define size of this descriptor = 9 bytes.
1
09H
1
bDescriptorType
Descriptor type = Interface
1
04H
2
bInterfaceNumber
Number of interface = 1, index = 0
1
00H
3
bAlternateSetting
Alternate setting value for the interface identified
in the prior field = 0
1
00H
4
bNumEndpoints
Number of endpoints used by this interface = 1
1
01H
5
bInterfaceClass
Class code = HUB_CLASSCODE = 09
1
09H
6
bInterfaceSubClass
Subclass code = 0
1
00H
7
bInterfaceProtocol
Protocol code = 0
1
00H
8
iInterface
Index of string descriptor describing this
interface = not supported
1
00H
9
Endpoint Descriptor (1)
The Endpoint Descriptor describes the Endpoint1 Descriptor which the Hub uses for status change report.
Offset
Field
Description
Size (bytes)
Value
0
bLength
Define size of this descriptor = 7 bytes
1
07H
1
bDescriptorType
Descriptor type = endpoint
1
05H
2
bEndpointAddress
The address of the IN endpoint
1
81H
3
bmAttributes
Endpoint1 attribute =IN, Interrupt Transfer
1
03H
4
wMaxPacketSize
Max. packet size Endpoint1 is capable of
sending = 1 byte
2
01H
00H
6
bInterval
Interval for polling endpoint for data transfers
1
FFH
Size (bytes)
Value
Note:
1. There is no endpoint descriptor for Endpoint0.
Hub Descriptor
The Hub Descriptor describes the AT43311’s Hub and ports.
Offset
10
Field
Definition
0
bDescLength
Define size of this descriptor = 9 bytes
1
09H
1
bDesriptorType
Descriptor Type = HUB_DESCRIPTOR = 29
1
29H
2
bNbrPorts
Number of downstream ports = 4
1
04H
3
wHubCharacteristics
Hub’s characteristics:
= Individual power switching
= Hub is not part of a compound device
= Individual Port Over-current Protection
2
09H
00H
5
bPwrOn2PwrGood
Time from the time power-on sequence begins
on a port until power is good on that port = 100
ms.
1
32H
6
bHubContrCurrent
Maximum current requirements of the hub
electronics = 100 mA.
1
64H
7
DeviceRemovable
Indicates if a port has removable device. All
downstream ports have removable devices
1
00H
8
PortPwrCtrlMask
Indicates if a port is not affected by gang-mode
power control request. All the AT43311’s ports
require manual SetPortFeature
(PORT_POWER) request to control the port’s
power state.
1
1EH
AT43311
AT43311
Standard Requests
Clear Endpoint Feature
All required Standard Requests are supported by the
AT43311. Standard Requests, or commands, are sent to
the AT43311 from the Host on the AT43311’s default pipe,
endpoint0. These requests are made using control transfers to endpoint0. The request and request parameters are
sent in a Setup packet which consists of eight bytes. The
following sections describe which requests are supported
by the AT43311 and the corresponding responses as well
as those requests not supported and responded with a
STALL packet.
The Clear Endpoint Feature request causes the AT43311
to clear an endpoint’s stall status bit if the condition causing
the stall has been removed. A Clear Endpoint Feature
occurs if a setup packet from the Host is decoded as:
Clear Device Feature
A Clear Device Feature will disable its remote wakeup feature when the setup packet is:
Field
Value
bmRequestType
Byte 0
x0000000B
bRequest
Byte 1
01H
wValue
Byte 2
Byte 3
01H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
00H
00H
Field
Value
bmRequestType
Byte 0
x0000002B
bRequest
Byte 1
01H
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
00H for EP0
81H for EP1
00H
Byte 6
Byte 7
00H
00H
wLength
Get_Configuration
Get_Configuration returns one byte of data. Bit 0 will be a
copy of bit 0 of the Controller_Status Register. All other bits
will be set to 0. This action will be taken, if the Setup packet
from host is decoded as:
Field
Value
bmRequestType
Byte 0
10000000B
Clear Interface Feature
bRequest
Byte 1
08H
AT43311 does not support this feature and will respond
with a STALL if a setup packet from the Host is decoded
as:
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
01H
00H
Field
Value
bmRequestType
Byte 0
x0000001B
bRequest
Byte 1
01H
wValue
Byte 2
Byte 3
xxH
xxH
wIndex
Byte 4
Byte 5
xxH
xxH
wLength
Byte 6
Byte 7
xxH
xxH
11
Get_Descriptor
Get_Interface
Get_Descriptor returns the requested descriptor. The last
word of the Get_Descriptor request specifies the number of
bytes the AT43311 is to return. If the requested descriptor
is longer than the requested number of bytes, AT43311 will
return only the requested number of bytes from the top of
the descriptor. If the requested descriptor is shorter than
the requested number of bytes, then the AT43311 indicates
the end of the control transfer by sending a short data
packet.
The requested number of bytes from the top of AT43311’s
Device Descriptor will be returned, if the Setup packet from
host is decoded as:
The AT43311 has a single interface with a value of 0. If it
receives a Get_Interface Request with the value of 0000H
as wIndex (bytes 2 and 3), the AT43311 will return a single
byte with a value of 00H. For any other value of wIndex the
AT43311 will return a STALL.
Field
Value
bmRequestType
Byte 0
10000000B
bRequest
Byte 1
06H
wValue
Byte 2
Byte 3
00H
01H
wIndex
Byte 4
Byte 5
00H
00H
Byte 6
Byte 7
# of bytes
requested
wLength
The requested number of bytes from AT43311’s Configuration Descriptor, Interface Descriptor, and Endpoint Descriptor will be returned, if the Setup packet from the Host is
decoded as:
Field
Value
bmRequestType
Byte 0
10000000B
bRequest
Byte 1
06H
wValue
Byte 2
Byte 3
00H
02H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
# of bytes
requested
12
AT43311
Field
Value
bmRequestType
Byte 0
10000001B
bRequest
Byte 1
0AH
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
01H
00H
Get Device Status
If the Setup packet from host is decoded as:
Field
Value
bmRequestType
Byte 0
10000000B
bRequest
Byte 1
00H
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
02H
00H
The Hub will return two bytes of data, byte 0 and byte 1, in
little endian order:
Byte 0, Bit 0 = 1, identifying the AT43311 as a self powered device.
Byte 0, Bit 1 = copy of bit 1 of the Controller_Status
Register. This bit reflects whether the AT43311’s
remote wakeup capability is enabled or disabled.
All other bits are set to 0.
AT43311
Get Interface Status
Set_Address
If the Setup packet from host is decoded as:
Set_Address sets the Hub’s address. The AT43311 will
save the value of bytes 2 and 3 into a temporary buffer.
After successful completion of the status stage, the
AT43311 transfers the temporary value into the
Hub_Address Register. The Hub_Address will be used as
the Hub’s address in all future transactions. Set_Address
will occur if the Setup packet from the Host is decoded as:
Field
Value
bmRequestType
Byte 0
10000001B
bRequest
Byte 1
0x00
wValue
Byte 2
Byte 3
0x00
0x00
wIndex
Byte 4
Byte 5
0xxx
0xxx
wLength
Byte 6
Byte 7
0x02
0x00
The Hub will respond with two bytes of data with all 0 value.
Field
bmRequestType
Byte 0
x0000000B
bRequest
Byte 1
05H
wValue
Byte 2
Byte 3
Device
Address
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
00H
00H
Get Endpoint Status
Get Endpoint Status returns two-bytes of data indicating
the stall status of the endpoint. The first bit of the first byte
returned reflects the status of the endpoint stall status bits
of the Controller_Status Register described in section 3.6.
These bits are set or cleared depending whether the endpoint is stalled or not:
Current Endpoint Status
First
Byte
Second
Byte
Stalled
01H
00H
Not stalled
00H
00H
Get Endpoint Status will execute if the following setup
packet is decoded as:
Field
Value
bmRequestType
Byte 0
10000010B
bRequest
Byte 1
00H
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
x0000001B for EP0
10000001B for EP1
00H
Byte 6
Byte 7
02H
00H
wLength
Value
Set_Configuration
Set_Configuration sets bit 0 of the Controller_Status Register according to the value of byte 2 of the Setup packet.
The AT43311 has only one configuration. The AT43311 will
only set the bit if byte 2 is either 00H or 01H, and bytes 3 to
7 are all zeroes. For all other values, the Hub will respond
with a STALL handshake packet. Set_Configuration occurs
if the Setup packet from host is decoded as:
Field
Value
bmRequestType
Byte 0
x0000000B
bRequest
Byte 1
09H
wValue
Byte 2
Byte 3
00H or 01H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
00H
00H
13
Set_Descriptor
Set Endpoint Feature
The AT43311 does not support this request. In response to
this request, the AT43311 will send a STALL handshake
packet. The Set_Descriptor occurs if the Setup packet from
the Host is decoded as:
Set Endpoint Feature sets the stall status bit of the
Controller_Status Register. The stalled endpoint will exhibit
the same behavior as in a stall condition. This feature is
activated if a setup packet from the Host is decoded as:
Field
Value
Field
Value
bmRequestType
Byte 0
x0000010B
07H
bRequest
Byte 1
03H
Byte 2
Byte 3
xxH
xxH
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
xxH
xxH
wIndex
Byte 4
wLength
Byte 6
Byte 7
xxH
xxH
Byte 5
00H for EP0
81H for EP1
00H
Byte 6
Byte 7
00H
00H
bmRequestType
Byte 0
00000000B
bRequest
Byte 1
wValue
Set Device Feature
Set Device Feature enables the remote wakeup feature if a
setup packet from the Host is decoded as:
Field
Value
wLength
Set_Interface
The AT43311 has a single interface and responds with a
STALL handshake packet if a Set_Interface request is
received with a value other than 0000H as a wValue (bytes
2 and 3).
bmRequestType
Byte 0
x0000000B
bRequest
Byte 1
03H
Field
wValue
Byte 2
Byte 3
01H
00H
bmRequestType
Byte 0
x0000001B
bRequest
Byte 1
0BH
wIndex
Byte 4
Byte 5
00H
00H
wValue
Byte 2
Byte 3
00H
00H
wLength
Byte 6
Byte 7
00H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
00H
00H
Set Interface Feature
AT43311 does not support this feature and will respond
with a STALL if a setup packet from the Host is decoded
as:
Field
Value
bmRequestType
Byte 0
x0000001B
bRequest
Byte 1
03H
wValue
Byte 2
Byte 3
xxH
xxH
wIndex
Byte 4
Byte 5
xxH
xxH
wLength
Byte 6
Byte 7
xxH
xxH
14
AT43311
Value
Sync_Frame
This request is for endpoints with isochronous transfers
only which the AT43311 does not support. AT43311 will
send a STALL packet if the setup packet from the Host is
decoded as:
Field
Value
bmRequestType
Byte 0
10000001B
bRequest
Byte 1
0CH
wValue
Byte 2
Byte 3
xxH
xxH
wIndex
Byte 4
Byte 5
xxH
xxH
wLength
Byte 6
Byte 7
xxH
xxH
AT43311
Hub-specific Requests
Clear_Port_Feature
All required Hub-specific requests are supported by the
AT43311’s Hub Controller. Hub-specific requests or commands are sent from the Host to the AT43311 using the
default pipe (Endpoint0). Hub-specific requests are made
using control transfers. The request and request parameters are sent in a setup packet consisting of eight bytes.
Clear_Port_Feature disables a port feature. Note that only
the relevant Clear Port commands are supported (see
CLEAR_PORT Features Table).
For example, the PORT_LOW_SPEED value is determined
by the operation of the port of the attached device. Upon an
in va li d r eq ue s t ( e .g. a C LE AR _P O RT r equ es t fo r
PORT_LOW_SPEED), the AT43311 will return a STALL
status to the host.
Clear_Hub_Feature
Clear_Hub_Feature resets a value reported in the Hub
Controller status. The status relates to the local power and
over current. AT43311 is a self-powered hub with a buspowered SIE and does not report over-current on a global
basis.
The Hub Controller will disable the reporting of Local Power
Status (C_HUB_LOCAL_POWER) if the setup packet from
the Host is decoded as:
Field
Value
bmRequestType
Byte 0
x0100000B
bRequest
Byte 1
01BH
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
00H
00H
AT43311 will respond with a STALL if the setup packet
from the Host requests the Hub Controller to clear the Over
Current Indicator (C_HUB_OVER_CURRENT):
Field
CLEAR_PORT Features Table
ClearPort
Feature
SetPort
Feature
PORT_CONNECTION
N
N
PORT_ENABLE
Y
Y
PORT_SUSPEND
Y
Y
PORT_OVER_CURRENT
Y
N
PORT_RESET
N
Y
PORT_POWER
Y
Y
PORT_LOW_SPEED
N
N
Port Feature
The Hub Controller will respond to a Clear Port Feature
request if the setup packet from the Host is decoded as:
Field
bmRequestType
Byte 0
x0100011B
bRequest
Byte 1
01H
wValue
Byte 2
Byte 3
See Port
Feature
Selector Table
wIndex
Byte 4
Byte 5
Port
Number
wLength
Byte 6
Byte 7
00H
00H
Value
bmRequestType
Byte 0
x0100000B
bRequest
Byte 1
01H
wValue
Byte 2
Byte 3
01H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
00H
00H
Value
15
Get_Hub_Descriptor
Port Feature Selector Table
Feature
Get_Hub_Descriptor returns the Hub Descriptor. The last
word of the Get_Hub_Descriptor request specifies the
number of bytes AT43311 is to return. If the requested
number of bytes is less than the 9-bytes length of the Hub
Descriptor, AT43311 will return only the requested number
of bytes from the top of the descriptor. If the requested
number of bytes is more than 9, then the returned data will
be padded with trailing bytes of zeroes.
This action will be taken if the Setup packet from the Host is
decoded as:
Value
PORT_CONNECTION
00H
PORT_ENABLE
01H
PORT_SUSPEND
02H
PORT_OVER_CURRENT
03H
PORT_RESET
04H
PORT_POWER
08H
PORT_LOW _SPEED
09H
Field
C_PORT_CONNECTION
10H
bmRequestType
Byte 0
10100000B
C_PORT_ENABLE
11H
bRequest
Byte 1
06H
C_PORT_SUSPEND
12H
wValue
Byte 2
Byte 3
29H
00H
C_PORT_OVER_CURRENT
13H
wIndex
C_PORT_RESET
14H
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
Number of Bytes
Requested
The Hub Controller will respond with a STALL if Port0 or a
port higher than Port4 is addressed in this request.
Get_Bus_State
When a Get_Bus_State is detected, the Hub Controller will
sample the bus status of Ports 1, 2, 3 and 4, at each EOF2
and will store the value in a register known as the
Port_Bus_State registers. The value of the D- signal (pin
DM[1:4]) will be in bit 0 and the value of the D+ signal
(DP[1:4]) will be in bit 1of each port’s Port_Bus_State register. All other bits will be 0. The values of these two register
bits will be transferred to the Host upon receipt of the
Get_Bus_State request, if the setup packet from Host is
decoded as:
Field
Value
bmRequestType
Byte 0
10100011B
bRequest
Byte 1
02H
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
Port
Number
wLength
Byte 6
Byte 7
01H
00H
The Hub Controller will respond with a STALL if Port0 or a
port higher than Port4 is addressed in this request.
16
AT43311
Value
AT43311
Get_Hub_Status
Get_Hub_Status returns the current Hub status that has changed since the previous acknowledgment of the setup packet
of the Host.
The Hub will returned two words of data as described in the following two tables. Word0 is the Hub Status Field, wHubStatus, and Word1 is the Hub Change Field,wHubChange.
Hub Status Field, wHubStatus
Bit
Description
0
Local Power Status, indicates the state of the local power supply
0 = Local power supply good
1 = Local power supply lost
1
Over-Current Indicator, indicates over-current condition on a global hub basis. AT43311 reports over current
condition on a per port basis therefore this bit is always read as 0
2-15
Reserved. Always read as 0’s
Hub Change Field, wHubChange
Bit
Description
0
Local Power Status Change, C_HUB_LOCAL_POWER, corresponds to bit 0 of wHubStatus
0 = No change has occurred in local power status
1 = Local power status has changed
1
Over-Current Indicator Change, C_HUB_OVER_CURRENT, corresponds to bit 1 of wHubStatus. AT43311
reports over current condition on a per port basis and therefore this bit is always read as 0
2-15
Reserved. Always read as 0’s.
A Get_Hub_Status will occur if the setup packet is decoded
as:
Field
Value
bmRequestType
Byte 0
10100000B
bRequest
Byte 1
00H
wValue
Byte 2
Byte 3
01H
00H
wIndex
Byte 4
Byte 5
00H
00H
wLength
Byte 6
Byte 7
04H
00H
17
Get_Port_Status
Get_Port_Status returns the current port status and the states that have changed since the previous acknowledgment. The
AT43311 returns two words of data as described in the following two tables. Word0 is the Port Status Field, and Word1 is
the Port Change Field. The AT43311 will respond with a STALL if Port0 or a port higher than Port4 is addressed in this
request.
Port Status Field, wPortStatus
Bit
0
Current Connect Status: PORT_CONNECTION
0 = no device present on this port
1 = a device is present on this port
1
Port Enabled/Disabled: PORT_ENABLE
0 = Port is disabled
1 = Port is enabled
2
Suspend: PORT_SUSPEND
0 = Not suspended
1 = Suspended
3
Over-Current Indicator: PORT_OVER_CURRENT
0 = Power operation normal for this port
1 = Over-current condition exists for this port. Power to this port has been shut off.
4
Reset: PORT_RESET
0 = Reset signalling not asserted
1 = Reset signalling asserted
5-7
Reserved. Always read as 0’s.
8
Port Power: PORT_POWER
0 = This port is powered OFF
1 = This port is powered ON
9
Low Speed Device Attached: PORT_LOW_SPEED
0 = Full Speed device attached to this port
1 = Low Speed device attached to this port
10-15
18
Description
Reserved. Always read as 0’s
AT43311
AT43311
Port Change Field, wPortChange
Bit
Description
0
Connect Status Change: C_PORT_CONNECTION
0 = No change has occurred on Current Connect status
1 = Current Connect Status has changed
1
Port Enable/Disable Change: C_PORT_ENABLE
0 = No change has occurred on Port Enabled/Disabled status
1 = Port Enabled/Disabled status has changed
2
Suspend Change: C_PORT_SUSPEND
0 = No change
1 = Resume complete
3
Over-Current Indicator Change: C_PORT_OVER_CURRENT
0 = No change has occurred on Over-Current indicator
1 = Over-Current indicator has changed
4
Reset Change: C_PORT_RESET
0 = No change
1 = Reset complete
5-15
Reserved. Always read as 0’s.
Get_Port_Status occurs if the setup packet from host is
decoded as:
Field
Value
bmRequestType
Byte 0
10100011B
bRequest
Byte 1
00BH
wValue
Byte 2
Byte 3
00H
00H
wIndex
Byte 4
Byte 5
Port
Number
wLength
Byte 6
Byte 7
04H
00H
Set_Hub_Feature
Set_Hub_Feature sets a value reported in the Hub status.
The status relates to the local power and over current. The
AT43311 is a self powered hub with its SIE powered from
the bus. The AT43311 will respond with a STALL if the
setup packet from the Host is decoded as:
Field
bmRequestType
Byte 0
x0100000B
bRequest
Byte 1
03H
wValue
Byte 2
Byte 3
xxH
xxH
wIndex
Byte 4
Byte 5
xxH
xxH
wLength
Byte 6
Byte 7
xxH
xxH
Set_Hub_Descriptor
The AT43311 has only one Hub Descriptor. Therefore the
AT43311 does not support this request. It will respond with
a STALL if the Setup packet from the Host is decoded as:
Field
Value
Value
bmRequestType
Byte 0
00100000B
bRequest
Byte 1
07H
wValue
Byte 2
Byte 3
xxH
xxH
wIndex
Byte 4
Byte 5
xxH
xxH
wLength
Byte 6
Byte 7
xxH
xxH
19
Set_Port_Feature
Port Feature Selector Table
Set_Port_Feature sets a value reported in the Hub Controller’s port status. The AT43311 supports all USB required
features. Note that only the relevant Set Port commands
are supported (see SET_PORT Features Table). For
example, the PORT_LOW_SPEED value is determined by
the operation of the port of the attached device. Upon an
invalid request (e.g. a Set_PORT request for
PORT_LOW_SPEED), the AT43311 will return a STALL
status to the host.
Feature
SET_PORT Features Table
ClearPort
Feature
SetPort
Feature
PORT_CONNECTION
N
N
PORT_ENABLE
Y
Y
PORT_SUSPEND
Y
Y
PORT_OVER_CURRENT
Y
N
PORT_RESET
N
Y
PORT_POWER
Y
Y
PORT_LOW_SPEED
N
N
Port Feature
The status relates to the port features as listed in the Port
Feature Table. AT43311 will respond to Set Port Feature
command if the setup packet from the Host is decoded as:
Field
Value
bmRequestType
Byte 0
x0100011B
bRequest
Byte 1
03H
wValue
Byte 2
Byte 3
See Port Feature
Selector Table
wIndex
Byte 4
Byte 5
Port
Number
wLength
Byte 6
Byte 7
00H
00H
20
AT43311
Value
PORT_CONNECTION
00H
PORT_ENABLE
01H
PORT_SUSPEND
02H
PORT_OVER_CURRENT
03H
PORT_RESET
04H
PORT_POWER
08H
PORT_LOW _SPEED
09H
C_PORT_CONNECTION
10H
C_PORT_ENABLE
11H
C_PORT_SUSPEND
12H
C_PORT_OVER_CURRENT
13H
C_PORT_RESET
14H
AT43311
Absolute Maximum Ratings
Operating Temperature .....................-55°C to +125°C
*NOTICE:
Storage Temperature ........................-65°C to +150°C
Voltage on any pin with
Respect to Ground ................................. -0.5V to 7.0V
Maximum Operating Voltage ................................6.6V
Stresses beyond those listed below may cause
permanent damage to the device. This is a stress
rating only and functional operation of the device
at these or any other conditions beyond those
indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods
may affect device reliability.
DC Output Current ............................................16 mA
DC Characteristics
The values shown in this table are valid for TA = 0°C to 85°C, VCC5 = 4.4 to 5.25V, VCC3 = 3V ± 5%, unless otherwise noted.
Power Supply
Symbol
Parameter
VCC5,VCCA
Condition
Min
Max
Unit
5V Power Supply
4.40
5.25
V
VCC3
3V Power Supply
3.15
3.45
V
ICC5
5V Supply Current
100
mA
ICC3
3V Supply Current
250
µA
ICCS
Suspended Device Current
250
µA
USB Signals: DPx, DMx
Symbol
Parameter
Condition
Min
Max
Unit
ILO
Hi-Z Data Line Leakage
0V < VIN < 3.3V
-10
+10
µA
VDI
Differential Input Sensitivity
DPx and DMx
0.2
VCM
Differential Common Mode
Range
0.8
2.5
V
VSE
Single Ended Receiver
Threshold
0.8
2.0
V
VOL1
Static Output Low Voltage
RL of 1.5K Ω to 3.6V
0.3
V
VOH1
Static Output High Voltage
RL of 15K Ω to GND
2.8
3.6
V
Min
Max
Unit
0.5
V
V
PWR[1:4], STAT[1:4]
Symbol
Parameter
Condition
VOL1
Output Low Level, STAT[1:4]
IOL = 8 mA
VOH1
Output High Level, STAT[1:4]
IOH = 8 mA
VOL2
Output Low Level, PWR[1:4]
IOL = 4 mA
0.5
V
COUT
Output capacitance
1 MHz
10
pF
VCC5 - 0.5V
V
21
Oscillator Signals: OSC1, OSC2 (1)
Symbol
Parameter
Condition
Min
Max
Unit
fOSC
Oscillator Frequency
6 MHz ± 0.25%
5.985
6.015
MHz
VLH
OSC1 switching level
0.47
1.20
V
VHL
OSC1 switching level
0.67
1.44
V
CX1
Input capacitance, OSC1
9
pF
CX2
Output capacitance, OSC2
9
pF
C1/2
OSC1/2 capacitance
1
pF
tSU
Start-up time
6 MHz, fundamental
10
ms
DL
Drive level
VCC5 = 5V, 6 MHz
crystal, 120 Ω equiv
series resistor
5
mW
Min
Max
Unit
+20
mV
Note:
1. OSC2 must not be used to drive other circuitry.
Comparator Signals: VREF, OVL[1:4]
Symbol
Parameter
Condition
VOS
Input Offset voltage
-20
AO
Open loop gain
80
CMIRL
Input CM range low
CMIRH
Input CM range high
CMRR
CM rejection ratio
CINR
Input capacitance, VREF#
10
pF
CINL
Input capacitance, all other
6
pF
dB
0
1 KHz
V
VCC5
V
92
dB
AC Characteristics
Dpx, Dmx Driver Characteristics, Full Speed Operation
Symbol
Parameter
Condition
Min
Max
Unit
TR
Rise time
CL = 50 pF
4
20
ns
TF
Fall time
CL = 50 pF
4
20
ns
TRFM
TR/TF matching
90
110
%
VCRS
Output signal crossover
1.3
2.0
V
ZDRV
Driver output resistance
28
43
Ω
22
AT43311
Steady state drive
AT43311
Dpx, Dmx Data Source Timings, Full Speed Operation
Symbol
Parameter
Condition
Min
Max
Unit
TDRATE
Full Speed Data Rate
Average Bit Rate
11.97
12.03
Mbs
TFRAME
Frame Interval
0.9995
1.0005
ms
TDJ1
TDJ2
Source Diff Driver Jitter To Next
Transition For Paired Transitions
-3.5
-4.0
3.5
4.0
ns
ns
TEOPT
Source EOP Width
160
175
ns
TDEOP
Differential to EOP Transition
Skew
-2
5
TJR1
TJR2
Recvr Data Jitter Tolerance To
Next Transition For Paired
Transitions
-18.5
-9
18.5
9
TEOPR1
TEOPR2
EOP Width at Receiver Must
Reject as EOP Must Receive as
EOP
40
82
ns
ns
ns
ns
ns
DPx, DMx Driver Characteristics, Low Speed Operation
Symbol
Parameter
Condition
Min
TR
Rise time
CL = 50 pF
75
TR
Rise time
CL = 350 pF
TF
Fall time
CL = 50 pF
TF
Fall time
CL = 350 pF
TRFM
TR/TF matching
VCRS
Output signal crossover
Max
Unit
ns
300
75
ns
ns
300
ns
80
120
%
1.3
2.0
V
Min
Max
Unit
70
40
ns
ns
Dpx, Dmx Hub Timings, High Speed Operation
Symbol
Parameter
Condition
THDD1
THDD2
Hub Differential Data Delay with
cable without cable
THDJ1
THDJ2
Hub Diff Driver Jitter To Next
Transition For Paired Transitions
-3
-1
3
1
ns
ns
TSOP
Data Bit Width Distortion after
SOP
-5
3
ns
TEOPD
Hub EOP Delay Relative to
THDD
0
15
ns
THESK
Hub EOP Output Width Skew
-15
15
ns
23
Dpx, Dmx Hub Timings, Low Speed Operation
Symbol
Parameter
TLHDD
Hub Differential Data Delay
TLHDJ1
TLHDJ2
Downstr Hub Diff Driver Jitter To
Next Transition For Paired
Transitions
TSOP
Data Bit Width Distortion after
SOP
TLEOPD
Hub EOP Delay Relative to
THDD
TLHESK
Hub EOP Output Width Skew
24
AT43311
Condition
Min
Max
Unit
300
ns
-45
-15
45
15
ns
ns
-60
45
ns
0
200
ns
-300
300
ns